IPL_NONE
#define os_mtx_init(lock) mutex_init(lock, MUTEX_DEFAULT, IPL_NONE)
wantipl == IPL_NONE ? 0 : MTX_SPIN);
#define IPL_NET IPL_NONE
if (ipl == IPL_NONE)
if (ints && ipl != IPL_NONE)
else if (!ints && ipl == IPL_NONE)
#define os_mtx_init(lock) mutex_init(lock, MUTEX_DEFAULT, IPL_NONE)